Method for analyzing crushing property of composite material coated twelve-rectangular-cross-section thin-walled beam

Abstract

The present invention discloses a method for analyzing a crushing property of a composite material coated twelve-rectangular-cross-section thin-walled beam and aims to solve the problem that crushing property analysis of the thin-walled beam cannot be performed by using a finite element method or an experimental method due to a shortage of a geometrical model with a detailed structure in a conceptual design stage of crashworthiness of a car body. The method comprises the steps: 1, deducing an average crushing counter force analytic expression of a non composite material coated hollow twelve-rectangular thin-walled beam; 2, simplifying a stress-strain curve of a fiber reinforced composite material, i.e. in the stretching process, a stress-strain relationship is shown as linearity until the fiber reinforced composite material is broken, and in the compressing process, the stress is kept at a certain level without a change after yielding; 3, calculating a plastic limit bending moment and a limit yielding membrane stress of the fiber reinforced composite material coated twelve-rectangular-cross-section thin-walled beam; 4, correcting an effective crushing distance and a final folding angle of the fiber reinforced composite material coated twelve-rectangular-cross-section thin-walled beam; and 5, deducing the average crushing counter force analytic expression of the fiber reinforced composite material coated twelve-rectangular-cross-section thin-walled beam.

Description

technical field [0001] The invention relates to an analysis method in the field of automobile passive safety research, more precisely, the invention relates to a method for analyzing the crushing characteristics of a thin-walled beam with twelve right-angled sections wrapped in composite materials. Background technique [0002] Thin-walled beam structure is a common energy-absorbing component in the fields of automobiles, ships, aviation and aerospace, etc. Its axial crush deformation is stable and energy absorption is significant, and it is an important topic in the study of crashworthiness. At present, the crashworthiness design of thin-walled beams usually adopts a combination of experiment and finite element analysis. That is, large deformation nonlinear finite element software is used for simulation calculation and structural optimization design, and finally verified by experiments. However, due to the frequent replacement of schemes in the early stage of design, the f...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the problem that the finite element method or test method cannot be used to analyze the crushing performance of thin-walled beams due to the lack of a detailed structural geometric model in the concept design stage of the crashworthiness of the vehicle body, and to provide a composite material-wrapped Analytical method for crushing characteristics of thin-walled beams with twelve right-angled sections

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